Permanent manget synchronous motor and method assembling same

Abstract

A permanent magnet synchronous motor is provided in the present disclosure. The permanent magnet synchronous motor includes a rotor and a stator, wherein the rotor comprises a rotating shaft and a cylindrical magnet surrounding the rotating shaft, the stator comprises a base, a cylindrical core received in the base and surrounding the magnet and coil windings assembled with the core, the coil windings are symmetrical about the center axis of the core, the coil winding comprises a plurality of coils inserted into the core, each coil comprises a body part and extended parts respectively extended from two ends of the body part, a plurality of body parts are superposed and disposed in the core, a plurality of extended parts are respectively extended in the radial direction of the core and fixed on two end faces of the core, and the plurality of extended parts are partially superposed and distributed in a step shape.

What is claimed is: 
     
       1. A permanent magnet synchronous motor, comprising:
 a rotor, wherein the rotor comprises:
 a rotating shaft, and 
 a cylindrical magnet surrounding the rotating shaft; 
 
 a stator, wherein the stator comprises:
 a base, 
 a cylindrical core received in the base and surrounding the magnet, and 
 coil windings assembled with the core, wherein the coil windings are symmetrical about the center axis of the core, and the coil winding comprises a plurality of coils inserted into the core, each coil comprises a body part and extended parts respectively extended from two ends of the body part, a plurality of body parts are superposed and disposed in the core, a plurality of extended parts are respectively extended in the radial direction of the core and fixed on two end faces of the core, and the plurality of extended parts are partially superposed and distributed in a step shape. 
 
 
     
     
       2. The permanent magnet synchronous motor as described in  claim 1 , wherein the body part comprises a first strip and a second strip parallel to each other at interval, and a straight slot is formed between the first strip and the second strip. 
     
     
       3. The permanent magnet synchronous motor as described in  claim 2 , wherein the width of the straight slot is equal to the sum of the widths of the first strip and the second strip. 
     
     
       4. The permanent magnet synchronous motor as described in  claim 3 , wherein the quantity of coils of each coil winding is n, the straight slot of the (n−2)th coil is opposite to the first strip of the (n−1)th coil and the first strip of the nth coil respectively, the straight slot of the (n−1)th coil is opposite to the second strip of the (n−2)th coil and the second strip of the nth coil respectively, the straight slot of the nth coil is opposite to the second strip of the (n−2)th coil and the second strip of the (n−1)th coil respectively, and n≥3. 
     
     
       5. The permanent magnet synchronous motor as described in  claim 1 , wherein the lengths of the coils in each coil winding are gradually increased in the radial direction of the core from outside to inside. 
     
     
       6. The permanent magnet synchronous motor as described in  claim 5 , wherein the quantity of coils of each coil winding is n, the extended parts of the (n−2)th coil are fixed on the end face of the core, the extended parts of the (n−1)th coil are partially superposed on the extended parts of the (n−2)th coil, the extended parts of the nth coil are partially superposed on the extended parts of the (n−1)th coil, and n≥3. 
     
     
       7. The permanent magnet synchronous motor as described in  claim 1 , wherein there are two coil windings. 
     
     
       8. The permanent magnet synchronous motor as described in  claim 1 , wherein the extended parts are arc-shaped. 
     
     
       9. An assembly method of the permanent magnet synchronous motor as described in  claim 1 , comprising the following steps:
 providing a plurality of coils, a core, a base, a first bearing, a second bearing, a rotating shaft, a magnet and a bracket; 
 partially superposing the plurality of coils in sequence and winding the coils to form coil windings; 
 inserting and assembling the coil windings into the core; 
 fixedly assembling the first bearing on the base; 
 installing the core assembled with the coil windings into the base to form a stator; 
 assembling the rotating shaft to the magnet to form a rotor; 
 inserting the rotor into the core of the stator, and connecting one end of the rotating shaft with the first bearing in a matching mode; and 
 fixedly installing the second bearing on the bracket, connecting the other end of the rotating shaft with the second bearing in a matching mode, and simultaneously fixing the bracket on the base via bolts.